Was I cruel?

Walking home from spending the afternoon playing with Eli (the 16-month-old I babysit), a kid (well, probably a 13 year-old, but he looked like a kid and I like referring to him as one. Quite cute looking, blonde, not unattractive, but cute in the young and baby-faced sense) approached me, clutching a whole load of small change and asked if I could go and get him some cigarettes, as the shop wouldn't serve him (by the way, he didn't already smell of smoke, indicating it was the first packet for an hour or two at least I reckon). Anyway, I said no. A few grounds, some to do with religion: a) they were only young (he had a couple of mates hanging around too, who clearly had chipped in with the few pounds clutched in the kid's hand); 2) one isn't supposed to use money on Shabbat (buy or sell things); d) one isn't supposed to carry on Shabbat. I only thought of that third one afterwards, but the first two struck me straight away. The third reason is still valid though. Anyway, I refused. And the kid just walked away, no shouts, explosions, questions, re-asking, mates asking instead or anything. I suppose there are some kids in the area who are reasonable apart from the fact that they smoke. They weren't like the scary ones who hang around on the rape bridge, anyway. (The "rape bridge" is the footbridge at the end of my road leading to the nearest tube station. Not overly safe for a woman to walk over on her own in the dark. Especially when the light isn't working or one can smell fumes. Or see and hear people.)